In the past, I have always booked the restaurant at the resort we will be staying in. However, we have learned, due to changes and delays with the airlines, we have decided to eat CS meals (at the resort) for our first dinner.
However, I did find that most resorts that we have stayed in had availability for the few times we had no delays and had time to eat a TS meal. Here are my experience. The following is the ones that we could easily get into:
Boma (after 7:30pm)
Captain's Grille
Spoodles (but they are changing this soon, so probably redundant at this point)
Kona Cafe
Grand Floridian Cafe
Maya Grill
Turf Club at SSR
However, the following restaurants we found a bit harder to get in with short notice:
Whispering Canyon Cafe
Cape May Cafe
I'm sure there are many others, but these ones are the only ones we tried with very little notice.
Good Luck.